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Advantages and disadvantages of CNC toolholders
Release time:
2025-01-12
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As for the thermal expansion tool holder, as the name suggests, it uses the method of thermal expansion and contraction. When heated to a certain temperature, the clamping part of the tool holder is slightly enlarged. Put the tool in. After cooling, the tool is fixed.
Anyone who knows something about CNC tools should know several types of tool holders and have some understanding of basic tools. However, I believe that you may not have a comprehensive understanding of the detailed classification of tool holders and the advantages and disadvantages of each tool holder. Let me introduce it to you. The first type is a relatively old-fashioned tool holder, a side-fixed tool holder, which uses two screws to fix the tool. It is simple and fast, and has a strong clamping force. However, it is not very versatile. Each tool holder can only hold tools with the same handle neck.
As for the thermal expansion tool holder, as the name suggests, it uses the method of thermal expansion and contraction. When heated to a certain temperature, the clamping part of the tool holder is slightly enlarged. Put the tool in. After cooling, the tool is fixed. Its advantages are high precision, generally within 2um. The clamping force is relatively large, the support is good, and the radial runout is 2um-5um. However, each tool holder can only hold a tool with a handle diameter. And every time the tool is changed, it must be heated, which will cause greater damage to the tool holder. If it is made in Japan, it can only be used about 200 times, and if it is made in Germany, it can generally only be used about 600 times.
There is also a hydraulic tool holder. I personally think that the design principle of this tool holder is very interesting. It uses hydraulic fixed tool holders, and the precision is very high. The surface runout is generally 2um. The clamping force is very strong, the rigidity is good, and it can transmit higher clamping torque. However, it has a very painful disadvantage, that is, the price is too expensive. It can be said to be the most expensive tool holder.
There is also the cold pressing/GP tool holder that is gradually becoming popular. The tool holder is installed by a machine. The machine pushes the tool upward with great force. Because its surface is coated, it has high durability, generally more than 20,000 times. Its clamping force is also very large. The disassembly and assembly time is short, and the circumferential radial runout is 0.003mm.
There are many other types of tool holders, such as the most used spring chuck tool holder, which is fixed by a spring chuck. There are also tapping tool holders that use screws to fix the tool, etc.
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